Fig. 1. Flow control flow chart of centrifugal pump

Fig. 2. Schematic Diagram of Centrifugal Pump

Fig. 3. Speed control curve under different K_p values

Fig. 4. Flow control curve under different K_p values

Fig. 5. Relationship between proportional coefficient and flow oscillation

Fig. 6. Relationship between proportional coefficient and control dynamic performance

Fig. 7. Comparison diagram of centrifugal pump outlet flow and pressure

Fig. 8. Control curve of integral parameter under K_p=20

Fig. 9. Control curve of integral parameter under K_p=70

Fig. 10. The first peak value of the flow under different integral gains

Fig. 11. Convergence time of flow control under different integral gains

Fig. 12. Flow control curve of centrifugal pump under different K_d values